<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>

</body>
<script>
    // alert(1);
    var a = 1;
    eval("a=100;c=300");// a = 100;c = 300;
    console.log(a,c);
</script>
</html>